Question: In what year did Martha Argerich marry Stephen Kovacevich?
Paraphrase: Martha Argerich and Stephen Kovacevich were wed in what year?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q156810 p:P26 ?s . ?s ps:P26 wd:Q1503615 . ?s pq:P580 ?value}